George scott chiles



Patented Apr. 17, 1923.

GEGRGE SCOTT CHILES,

0F CHECASG, LLNOIS.

, CAR TRUCK.

Application ined nay i5,

T 0 all whom t may concern Be it known that I, lnonen Sco'r'r Crimes, acitizen of the United States, and a resident oi Chicago; in the countyof.' Cook and State of Illinois, have invented certain new and usefulImprovements in Car Trucks, or which the following is a specification.

The invention described and clairA ed here-A in is a modification of theinventions more generically claimed in my copending applr cations,berial No. 470 465, 'for .railway truck constr ction, filed li/lay 17,1921, Elerial No. 516,554, for trucks, filed November 21, 1921, and myapplication Serial No. 561,132, for railway trucks, executed of evendate herewith.

My invention broadly stated consists in my improved grouping ot thetruck springs and an improved side-frame, bolster and spring plankcoacting with the improved spring assemblage. ln the copendingapplications above referred to, l have described and claimedapplications of my inventionwherein the springs are placed between thecolumns of the side-trame, tl e side-frame having a central bolsteropening.

In the modification herein described, l construct the side-frame with asingle central column connecting the tension and compres sion members,divide the springs into two groups, one on each sideof the centralcolumn, and form the bolster and spring plank, when a spring plank isused, with divided ends embracing` the central column. ln the form of myinvention herein described, l preferably construct the tension member inthe form of a suspension line curve; that is, with the cross-sectionalcenter of mass of the tension member lyingsubstantially in a suspensionline throughout the length of saidmember. `The suspension l-ne uponwhich the tension member is constructed is the curve which would beassumed by a {lexi ble member, such as a cable or chain suspended at itsends and with a vertiral load of the magnitude and distribution tolwhich the side-frame is subjected. The use of the suspension line formof tension member throws substantially all ol the vertical load stressin that member into tension, thereby eliminating bending stresses andrendering is possible to lighten the frame. ln my improved springassemblages, the springs distributed endwise` of the sde-franiie morewidely than in assemblages now in use, and this widerk distribution ofthe springs has 1922. Serial No. 561,133.

two advantageous results.

a lt affords a wider' support ror 1 N the end of the bolster,alrorrlling increased resistance to elaine iorces imposed upon thebolster, and "ne wider dis rib Aon of the springs also in ofresultant;suspension urve liaV would f c obtained by conentratthesprings at the center of the side'- ie with the present type ofconstruc- Jr, w r'rv 5 ,l .1!

non. his natte img oi the suspension line increases the ical distancebetween the tension and compression members intermed te Jthe center andends of the side-frame thus aflording more ample head room for the endsprings oi 'he assemblage. The :nlcption oi. the suspension line foi-iiiof tension member and 'the resultant throwing of the stresses intotension, gives greater latitude in adapting the crossesectioinal formof' the tension member to the accommodation of the springs and bolsterthan is possible when the tension member is subjected to severe bendingstresses. The l bending stresses to whis-h types of side-frames new inuse are subjected nec tate a relatively great vertical cross-sectionaldepth in the tension member, which depth, taken in connectiou vith thenecessary road clearance, imposes a limitation upon the depth ot thebolster opening, and consequently upon the depth or the bolster end.With the tension member in the Yform of a suspension line and thesresses substantially allv in tension the vertical depth of the tensionmember 9may be much less than in the forms of construction now in use,and the height of the bolster opening inay be correspondingly increased.The neressary tensile strength in the tension member is preserved byvincreasing its width trans* ersely el the side-frame the increasedwidth affording space for proper seating or the springs without theextent ot overhang necessari/iin the present form o'I siderames. rlhetransverselwidening or the tension member also serves ther springsbetween the columns, and to sideL frames of the form herein describedand claimed wherein a column is placed at the center. Other advantagesof my improved construction will appear from the following descriptionot a specific embodiment of my invention.

ln the drawings, Figure l is a view in elevation ol a sideirame,bolster, springs and spring plank embodyingn my invention, the structureillustrated being broken away at one end to admit of a larger scaledrawing,

Figure 2 is a top plan viewT of the structure shown in Figure l,

Figure 3 is a view from beneath of the structure shown in. Figure l, and

AFigure 4L isa top plan view ot the end of the bolster.

l have shown in ithe drawings an integral side-framel designed toreceive separable journal boxes, but it will be aliparent that myinvention is not limited to a side-frame of that` type or to integralside-frames. ln the lorm of side-frame illustrated, the compressionmember. l may be oi channel i'orm.

The tension member may be of similar ory other suitable 'form down toabout the point indicated by the numeral 2. ln the specitic formillustrated, the tension member is of channel section. and thecrossfsectional center of mass of the tension member throughout itslength between `its point ot suspension over the journal boxes liessubstantially in the suspension line curve thatwould be assumedby aflexible member subjected to the vertical load for which the sideitrameis designed. its illustrated, the compression and tension members areconnected at the center of the sideirame by a vertical column 3. I haveillustrated an assemblage or six springs divided into groups of threeeach, one group upon each side of the central column 3. The two springsadjacent the columns are arranged abreast; that is, in a pair transverseof 'the side-frame, and the third spring is placed substantially uponthe longitudinal center line of the side-A` e frame. ln this embodimentor my invention, as in all forms of my improved spring,r assemblage, theoutermost ends of the spring; assembla`,0 ;e` consist oi.E singlesprings upon or adjacent to the longitudinal center line s of thesidedrame.

By. having single springs 4; at each end or the assemblage, l am betterenabled to maintain the suspension line and also thenecessary Verticalspace between the spring seat and bolster. The spring seat takes theform of a web which is so disposed with relation to the remainder of thesection as to maintain the cross-sectional center ci' mass substantiallyin a suspension line. This web begins at the upper. edges of the sidewalls of Vthe channel section which forms the end portions or' thetension member at the point which it merges as indicated at 10j-l0 in l"igure 3. The portion oil the spring seat lies at a lower ,level thanpart of the transfversely `adj acent metal of .the side-trarne, the10ml" ,part of .the ,end Springs ebengthus recessed in the tensionmember. vThis permits the tension member to follow the suspension .lineat this point without interfering vwith .the space necessary for the.end

springs. The bolster andspring plank vare recessed at their endsindcetedetll 2.1111112, te

embrace the column 3. The two Acentral pairs .of Springs 1.3-1-.13 lieunder the main portion lll of. the bolster, which is proyidegl withextensions 15 01 lese depth than .the

'central portion, lsaid projections resting on the @11d Springs 4 "Inthe Wesen-5 insti-1146s,

,have shown ,the .Spring plank 16 linearly? ing the four central springsonly `and provided with upwardly projecting side walls` 17 which are`offset inwardlyat 1,8 to permit closer spacing of the springs.

'While I have herein illustrated and `,de-

scribed a `Specie@ embodiment Qmy' 1111-.

proved .truck Construction? lmyintentie.11, is not limited thereto butmay be varied With.- n thelmts dened in thefpllowns Claims? Al. ln acartruck, a siderame comprising an upper compression member, a lowertension member, e column @meeting Seid-,Coma

PYGSSQI; and tension members' at the central part. thereof, Springs.Supported on Said tea Sion member on each ,Side of .Said Column, Someorf-Said Springs beine .Oset fromme Onetuflnal Center line of saidSide-frame..

2. `ln acar truck, al sigle-freine, Springs, a bolster supported onVSaid springs, said bolster beu-1s reeessed at .the end, partei saidsprings beingin each side ot saidrecess.

3- n a .Car truck, e sidelrame comprising an upper compression member, alower kmo tension member, the ycrossisectional center.

ot' mass oli saidtensionmember throughout its length lying substantiallyin a 'suspen vsion line curve, and column connectingsaidrcompression andtension members .at the central part thereof.

In a 'car truck, a side-trame comprising an upper compression member, alower ten-` sion member, the cross-sectional centeruo'f f mass lof .saidtension member throughout its length lying substantially in asuspensionline curve, and a column connecting said compression and tension membersat the central part thereof, springs supported on said tension member oneach side of said column, and a bolster resting on said springs andhaving a recess in its end embracing said column.

5. In a car truck, a side-frame comprising an upper compression member,a. lower tension member, a. column connecting said compression andtension members at the central part thereof, a group of springssupported on said tension member on each side of said column, the partof each of said groups of springs most remote from said columnconsisting of a single spring.

6. In a. car truck, a side-frame comprising an upper compression member,a loWer tension member, the cross-sectional center of mass of saidtension member throughout its length. lying substantially in asuspension line curve, a column connecting said compression and tensionmembers at the central part thereof, and a spring plank resting on saidtension member and having a recess in its end embracing said column.

7. In a car truck, a side-frame comprising an upper compression member,a lower tension member, and a column connecting said compression andtension members at the central part thereof, a group of springssupported on said tension member on each side of said column, the partof each of said groups of springs mostremote from said columnconsistingl of a single spring, and a spring plank resting on saidtension member and having a recess in its end embracing said column.

In witness whereof, I hereunto subscribe my name this 12th day of May,A. D., 1922.

GEORGE SCOTT CHILES.

